7950993221 has 2 divisors, whose sum is σ = 7950993222. Its totient is φ = 7950993220.

The previous prime is 7950993209. The next prime is 7950993277. The reversal of 7950993221 is 1223990597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6644532196 + 1306461025 = 81514^2 + 36145^2 .

It is an emirp because it is prime and its reverse (1223990597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7950993221 - 2²⁶ = 7883884357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7950993121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3975496610 + 3975496611.

It is an arithmetic number, because the mean of its divisors is an integer number (3975496611).

Almost surely, 2^7950993221 is an apocalyptic number.

It is an amenable number.

7950993221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7950993221 is an equidigital number, since it uses as much as digits as its factorization.

7950993221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 7950993221 is about 89168.3420334818. The cubic root of 7950993221 is about 1995.9077341410.

The spelling of 7950993221 in words is "seven billion, nine hundred fifty million, nine hundred ninety-three thousand, two hundred twenty-one".